Speaking as a consultation on the issues comes to a close, he said the changes would lead to a creation of jobs in areas of high unemployment.
Responding to Labour's David Hanson (Delyn) during business questions in the Commons, he said: "I'm sure you agree with choice.
"If a local authority decides it's the right thing for them - so for example if it's a local area that perhaps has higher unemployment than elsewhere and they think it will help to create jobs for local working people then that would clearly be a good thing.
"There was a time when Labour used to be the party of working people, what's happened?"
The plans, which were announced in George Osborne's summer Budget, is opposed by many church groups and the unions.
Campaign group Christian Concern is calling on believers to take part in the consultation.
It said: "A day of 'shared rest' is built in to God's design for creation, for the good of all.
"Erosion of Sunday trading restrictions will make it harder for some families to spend time together. It may also make it harder for some people to attend church."